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WAV to MP3No install · No upload · No account
Free MP3 converter, nothing to install
Drop your WAV files and get MP3s back — up to 320 kbps, up to 25 files at a time, entirely inside your browser. No file ever touches a server.
A 3-minute stereo WAV weighs about 30 MB; the same track as a 320 kbps MP3 is roughly 7 MB — 77% smaller, with quality most ears can't tell apart.
- 100% free
- No upload
- No signup
- Up to 25 files
- 320 kbps MP3
Drag WAV files here — they turn into MP3s on this device
.wav up to 200 MB each, 25 files per batch — nothing is uploaded
How to convert audio to MP3 for free
Three steps, all on your own device — no account, no upload queue and no software to install.
Add your audio files
Drag up to 25 WAV files (200 MB each) into the drop zone, or press “Pick WAV files” to browse. Conversion starts the moment a file lands.
Choose the MP3 bitrate
320 kbps is the default and keeps the most detail. Switch to 192 kbps for a good balance of size and quality, or 128 kbps when file size is the priority.
Download the MP3s
Each finished file shows its original size, MP3 size and the compression ratio. Grab files one at a time or press “Download all” for the whole batch.
Technical specifications
| Input format | WAV (RIFF): 8/16/24/32-bit integer PCM, 32/64-bit float, A-law, µ-law |
|---|---|
| Output format | MP3, constant bitrate — 128, 160, 192, 256 or 320 kbps |
| Sample rates | 32, 44.1 and 48 kHz kept as-is; other rates resampled automatically |
| Channels | Mono and stereo preserved; surround down-mixed to stereo |
| Batch limit | 25 files per batch, 200 MB per file |
| Processing location | 100% on your device — LAME encoder in a Web Worker, no upload |
| Price | Free — no account, no watermark, no daily quota, no premium tier |
| Works offline | Yes, once the page has loaded |
Why “free” matters for an MP3 converter
Most online converters are free in name only. They cap you at one file, throttle large batches, force an account, strip quality to 128 kbps unless you pay, or — worst of all — upload your audio to a server where it sits on someone else's disk.
This converter sidesteps every one of those problems by running the LAME MP3 encoder — the same encoder behind most MP3s ever made — compiled to JavaScript and executed inside your browser tab. There is no server doing the work, so there is nothing to meter, nothing to queue, and nothing to charge for. You get 320 kbps, 25-file batches and unlimited sessions without creating an account or handing over an email address.
Frequently asked questions
Is this MP3 converter actually free?
Yes, completely free. There is no trial period, no daily cap, no watermark and no premium unlock. Every feature — 320 kbps output, 25-file batches, unlimited conversions — is available at no cost.
Do I need to install anything?
No. The converter runs entirely inside your browser using the LAME MP3 encoder compiled to JavaScript. There is no desktop app, no browser extension and no plugin to install.
Are my files uploaded to a server?
No. All encoding happens locally in a Web Worker on your device. Your audio never leaves your machine, which also means there is no upload queue — even a 200 MB file starts converting instantly.
What audio formats can I convert to MP3?
This converter accepts WAV files — the most common uncompressed audio format from recorders, DAWs and audio editors. It handles all PCM variants (8/16/24/32-bit integer, 32/64-bit float), A-law and µ-law. For other source formats, see the related tools below.
What MP3 bitrate should I use?
320 kbps for maximum quality — indistinguishable from the WAV original on most equipment. 192 kbps for a good everyday balance (podcasts, voice, background music). 128 kbps when small file size matters more than fidelity, like email attachments.
Can I convert multiple files to MP3 at once?
Yes — up to 25 files per batch, each up to 200 MB. They convert sequentially with a live progress bar, and a single “Download all” button saves every finished MP3.
Does it work on my phone?
Yes. The converter works in any modern browser — Chrome, Safari, Firefox, Edge — on phones, tablets and desktops. No app store download required.
Can I use it offline?
Yes. Once the page has loaded, the encoder runs entirely on your device. You can disconnect from the internet and keep converting.
Need the opposite direction?
The MP3 to WAV converter decodes MP3 back to uncompressed WAV at 16, 24 or 32-bit float — for editing, mastering, sampling or CD burning. Same browser, same privacy, same price (free).
Your files stay on your device
Every step — reading the WAV header, encoding the MP3, handing you the download — happens locally in a Web Worker. There is no server that could store, scan or leak your audio. The converter even keeps working if you go offline after the page loads.